CBR Characteristics and Swelling Behaviour of Black Cotton Soil Mixing with Fly Ash and Silica Fume

  • Beerendra Kumar Department of Civil Engineering, Bundelkhand Institute of Engineering and Technology, Jhansi, Uttar Pradesh, India
  • Ashish Gupta Department of Civil Engineering, Bundelkhand Institute of Engineering and Technology, Jhansi, Uttar Pradesh, India
  • Adarsh Kasaudhan Department of Civil Engineering, Bundelkhand Institute of Engineering and Technology, Jhansi, Uttar Pradesh, India
Keywords: Fly Ash, Silica Fume, Expansion of BCS, CBR, Black cotton soil

Abstract

Today’s rapid growing world produces waste that is very difficult to handle eco-friendly. Soil contamination is also one of the major geo-environmental issues by pouring industrial wastes directly over soil without treating it like caustic soda, fly ash, etc. Fly ash reaches ground water through percolation and pollutes the ground water. The main reason behind the soil contamination is due to rapid urbanization. This innovative and non-traditional research on waste utilization is gaining importance nowadays. Geotechnical engineers are adopting soil properties remolding and monitoring techniques by using waste material like fly ash Slag, Silica fume etc. This research aims to find the suitability of by-product silica fume and fly ash for Black cotton soil. In this research number of laboratory test are performed on black cotton soil using silica fume & fly ash as admixture in varying percentage. The outcome of the research shows the enhancement in properties of black cotton soil also significant decrease in free swelling index is observed. This expansive soil has very high swelling and shrinkage characteristics due to the clay mineral montemorillonite. It is found in abundant quantity in southern region of India and due to its poor characteristic, it is also termed as poor soil. Building any structure, road, bridge, embankment etc is so risky, and the solution is to replace this poor soil with good natural soil. Hence in this thesis work, emphasis is given on the use of black cotton soil by mixing stabilizers like silica fume and fly ash. Both increase the maximum dry density of black soil, and also CBR %value is increased. On adding silica fume, it also possesses a very low free swell value; hence, using both additives simultaneously will be a better solution to the problem of black cotton soil.

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Published
2022-12-26